Web crawlers need to estimate the frequency of changes to Web sites to maintain a current index
Question:
Web crawlers need to estimate the frequency of changes to Web sites to maintain a current index for Web searches. Assume that the changes to a Web site follow a Poisson process with a mean of 3.5 days.
(a) What is the probability that the next change occurs in less than 2.0 days?
(b) What is the probability that the time until the next change is greater 7.0 days?
(c) What is the time of the next change that is exceeded with probability 90%?
(d) What is the probability that the next change occurs in less than 10.0 days, given that it has not yet occurred after 3.0 days?
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X is an exponential random variable with ...View the full answer
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Related Book For 
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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